How to add different materials to different parts of a texture?
You could try it this way:


Prepare 3 pictures: the original B, a B&amp;W B to use as a cache to make the glossy appear, and normal map picture.
Mix a Diffuse (with the original picture) with a Glossy shader, use the B&amp;W picture as a factor in the Mix Shader.
As the Glossy shader may seem a bit dark, mix it with an Emission shader, but I guess the glossiness will depend on your environment, so you might not need that.
Load your normal map in an Image Texture node (Non-Color Data mode), plug it into a Normal Map node, plug this node into the normal sockets of the Diffuse and Glossy nodes.